How Accurate is the Cobb AP Readings?

cpunlamd · 04-06-2008, 05:32 PM

I down loaded the lastest v1.04 stg2 map from Cobb today and took her for a test drive. My AP reads target boost at 18.4psi and AFR locked at 11.1 @ WOT (in every gear).

Is this possible that the AFR's are locked exactly @ 11.1 in every gear on an OTS map?

How accurate is it really?

WESTI · 04-06-2008, 06:09 PM

18.4 is the max the AP will read as far as boost goes so it means you're boosting more than 18.4 in every gear. I dont know about the AFR so i wont comment on that

parkergc8 · 04-08-2008, 11:03 AM

To clarify, 18.4 psi is the maximum amount the ECU will output. This is not an AP limitation.

**Turninconcepts.com** · 04-08-2008, 06:10 PM

Not true. Cobb's software on the V1 AP, not sure about V2, will not display anything higher, but it is possible to read higher than 18.4 off the ECU.

The O2 sensor loses resolution outside of 13.5 or so on the rich side, so 11.1 means nothing.

Tony

**Rennes** · 04-11-2008, 04:17 AM

yeah, my AFR reads 11.1 as well. That's like perfect!

but ... nothing can be that perfect ...

import111 · 04-11-2008, 10:23 AM

A/F ratio on the AccessPORT is WRONG when you get into positive boost. Anything less than 0psi and the A/F is pretty accurate.

mofoSTI · 04-11-2008, 10:35 AM

I was hitting 23psi by 3200 rpm with my wategate helper trick and that read on my ap

josorl · 04-16-2008, 03:50 PM

Quote:

Originally Posted by cpunlamd

I down loaded the lastest v1.04 stg2 map from Cobb today and took her for a test drive. My AP reads target boost at 18.4psi and AFR locked at 11.1 @ WOT (in every gear).

Is this possible that the AFR's are locked exactly @ 11.1 in every gear on an OTS map?

How accurate is it really?

You need a wide band gauge for know the exact mix. The number of 11.1 is only a number that map put on a table but is not real.

04-06-2008, 05:32 PM	#1
cpunlamd Professional STI Racer Car: 07 WRX STI Fav Mod: Matching Dead Pedal Location: Wayne, NJ Posts: 791 Join Date: Jun 2007 Trader Rating: (0)	How Accurate is the Cobb AP Readings? I down loaded the lastest v1.04 stg2 map from Cobb today and took her for a test drive. My AP reads target boost at 18.4psi and AFR locked at 11.1 @ WOT (in every gear). Is this possible that the AFR's are locked exactly @ 11.1 in every gear on an OTS map? How accurate is it really? This ad is not endorsed by this member. Please register or login to hide this ad.

04-06-2008, 06:09 PM	#2
WESTI I'm Jim Halpert Car: 06 WRB STI Fav Mod: Ricer Flyby Location: Irvine, Ca Posts: 6,278 Join Date: Apr 2006 Trader Rating: (9)	Re: How Accurate is the Cobb AP Readings? 18.4 is the max the AP will read as far as boost goes so it means you're boosting more than 18.4 in every gear. I dont know about the AFR so i wont comment on that

04-08-2008, 11:03 AM	#3
parkergc8 Junior STI Driver Posts: 177 Join Date: Nov 2006 Trader Rating: (0)	Re: How Accurate is the Cobb AP Readings? To clarify, 18.4 psi is the maximum amount the ECU will output. This is not an AP limitation.

04-08-2008, 06:10 PM	#4
Turninconcepts.com Authorized Vendor Car: 04/08STI 95SVX 86E30 Posts: 5,067 Join Date: Jul 2003 Trader Rating: (53)	Re: How Accurate is the Cobb AP Readings? Not true. Cobb's software on the V1 AP, not sure about V2, will not display anything higher, but it is possible to read higher than 18.4 off the ECU. The O2 sensor loses resolution outside of 13.5 or so on the rich side, so 11.1 means nothing. Tony

04-11-2008, 04:17 AM	#5
Rennes Gold Member Car: 04 Subaru WRX STi Fav Mod: Fujitsubo!!!!!!!! Location: Québec Posts: 195 Join Date: Nov 2006 Trader Rating: (0)	Re: How Accurate is the Cobb AP Readings? yeah, my AFR reads 11.1 as well. That's like perfect! but ... nothing can be that perfect ...

04-11-2008, 10:23 AM	#6
import111 The Next Petter Solberg Car: Silver 05 WRX STi Location: Tucson, AZ. Posts: 908 Join Date: Dec 2004 Trader Rating: (0)	Re: How Accurate is the Cobb AP Readings? A/F ratio on the AccessPORT is WRONG when you get into positive boost. Anything less than 0psi and the A/F is pretty accurate.

04-11-2008, 10:35 AM	#7
mofoSTI Spec C Club Car: 08 STI,sr20det 510 Fav Mod: boob job for wife Location: springtuckey, OR Posts: 2,435 Join Date: Sep 2004 Trader Rating: (0)	Re: How Accurate is the Cobb AP Readings? I was hitting 23psi by 3200 rpm with my wategate helper trick and that read on my ap